Equipercentile linking of the Sheehan Disability Scale and the World Health Organization Assessment Schedule 2.0 scales in people with mental disorders

•To ensure that the scores from these two scales are exchangeable across treatments and diseases, a conversion is important.•We present a simple and reliable conversion table to convert SDS to WHODAS scores or vice versa using equipercentile equating method.•The scores were consistent for the entire range of scores when the SDS scores were converted to the WHODAS or vice versa.•This is the first study that provided an algorithm that enable data across these two disability measures to be used interchangeably.